Kinetics of supercritical fluid extraction of bituminous coal with tert-butanol
Technical Report
·
OSTI ID:5298710
This paper presents a simplified kinetics study of supercritical tert-butanol extraction of Illinois No. 6 bituminous coal. Extraction rates were estimated by continuously measuring the spectrophotometric absorbance (at 235 nm) of the effluent from a fixed-bed flow reactor. The experiments were conducted in the temperature range of 553--633 K and at 6.8 MPa constant pressure by programmed-temperature techniques. A model for which the extractable material is represented by two groups of components, undergoing parallel first-order reactions, satisfactorily describes the experimental data. The kinetics data indicate that the first group is extracted by a physical process which occurs below 573 K. The second group is extracted via a thermal decomposition reaction (with an apparent, average activation energy of 54 kJ/gmol) which is dominant above 573 K. Total fractions extracted were low ({le} 8 wt. %) at the temperature and pressure employed. 21 refs., 10 figs., 3 tabs.
- Research Organization:
- California Univ., Davis, CA (United States). Dept. of Chemical Engineering
- Sponsoring Organization:
- DOE; USDOE, Washington, DC (United States)
- DOE Contract Number:
- FG22-90PC90288
- OSTI ID:
- 5298710
- Report Number(s):
- DOE/PC/90288-T1; ON: DE91018736
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
01 COAL, LIGNITE, AND PEAT
010405* -- Coal
Lignite
& Peat-- Hydrogenation & Liquefaction
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400105 -- Separation Procedures
ACTIVATION ENERGY
ALCOHOLS
BITUMINOUS COAL
BLACK COAL
BUTANOLS
CARBONACEOUS MATERIALS
COAL
DOCUMENT TYPES
ENERGY
ENERGY SOURCES
EXTRACTION
FOSSIL FUELS
FUELS
HYDROXY COMPOUNDS
KINETICS
MATERIALS
ORGANIC COMPOUNDS
PROGRESS REPORT
SEPARATION PROCESSES
SOLVENT EXTRACTION
SOLVENT PROPERTIES
SPECTROPHOTOMETRY
SUPERCRITICAL GAS EXTRACTION
TEMPERATURE EFFECTS
010405* -- Coal
Lignite
& Peat-- Hydrogenation & Liquefaction
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400105 -- Separation Procedures
ACTIVATION ENERGY
ALCOHOLS
BITUMINOUS COAL
BLACK COAL
BUTANOLS
CARBONACEOUS MATERIALS
COAL
DOCUMENT TYPES
ENERGY
ENERGY SOURCES
EXTRACTION
FOSSIL FUELS
FUELS
HYDROXY COMPOUNDS
KINETICS
MATERIALS
ORGANIC COMPOUNDS
PROGRESS REPORT
SEPARATION PROCESSES
SOLVENT EXTRACTION
SOLVENT PROPERTIES
SPECTROPHOTOMETRY
SUPERCRITICAL GAS EXTRACTION
TEMPERATURE EFFECTS